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== Octave equivalence ==

The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same "pitch class" despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name.

The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same "pitch class" despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name. For the same reason, most [[scales]] or repeat at the octave.

The perception of octave equivalence appears to have both biological and cultural components.

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However, the degree of octave equivalence perception varies across cultures, particularly in those with non-Western musical traditions.<ref>Jacoby, Nori et al. [https://doi.org/10.17605/OSF.IO/DW39V ''Universal and Non-universal Features of Musical Pitch Perception Revealed by Singing'']. Current Biology, 2019.</ref>

When a different interval (such as the [[tritave]]) is used as the interval of equivalence, it is referred to as an [[equave]] or ~~sometimes~~ formal octave.

When a different interval (such as the [[tritave]]) is used as the interval of equivalence, it is referred to as an [[equave]] or "formal octave".

== Octave stretch ==

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 == Octave equivalence ==
-The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same "pitch class" despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name.
+The octave is usually called the '''interval of equivalence''', because tones separated by this interval are perceived as having the same "pitch class" despite their different absolute pitches. This equivalence is so strong that in most musical notation systems, notes separated by octaves share the same name. For the same reason, most [[scales]] or repeat at the octave.
 The perception of octave equivalence appears to have both biological and cultural components.
@@ Line 22: / Line 22: @@
 However, the degree of octave equivalence perception varies across cultures, particularly in those with non-Western musical traditions.<ref>Jacoby, Nori et al. [https://doi.org/10.17605/OSF.IO/DW39V ''Universal and Non-universal Features of Musical Pitch Perception Revealed by Singing'']. Current Biology, 2019.</ref>
-When a different interval (such as the [[tritave]]) is used as the interval of equivalence, it is referred to as an [[equave]] or sometimes formal octave.
+When a different interval (such as the [[tritave]]) is used as the interval of equivalence, it is referred to as an [[equave]] or "formal octave".
 == Octave stretch ==